Table 7.
Variable assignment
| Variable | Assignment |
|---|---|
| Age | ≥65 years =1, <65 years =0 |
| Gender | Male =1, Female =0 |
| COPD Duration (years) | <10=0, 10-20=1, >20=2 |
| Smoking History | Present =1, Absent =0 |
| Corticosteroid Treatment | Present =1, Absent =0 |
| GOLD Classification | I =0, II =1, III =2, IV =3 |
| IL-17 (pg/mL) | ≤6.635=0, >6.635=1 |
| IL-33 (pg/mL) | ≤5.78=0, >5.78=1 |
| FEV1 (L) | ≤1.405=0, >1.405=1 |
| FVC (L) | ≤2.905=0, >2.905=1 |
| FEV1/FVC (%) | ≤60.05=0, >60.05=1 |
| RV (L) | ≤2.625=0, >2.625=1 |
| RV/TLC (%) | ≤48.23=0, >48.23=1 |
Note: IL-17: Interleukin-17, IL-33: Interleukin-33, FEV1: Forced Expiratory Volume in 1 second, FVC: Forced Vital Capacity, FEV1/FVC%: FEV1 to FVC Ratio, RV: Residual Volume, RV/TLC%: RV to TLC Ratio, COPD: Chronic Obstructive Pulmonary Disease, GOLD: Global Initiative for Chronic Obstructive Lung Disease.